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CONSOLIDATED INTERIM STATEMENT OF COMPREHENSIVE INCOME - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
CONSOLIDATED INTERIM STATEMENT OF COMPREHENSIVE INCOME        
(Loss)/profit for the period $ (10) $ 100 $ (11) $ 157
Foreign currency translation adjustments:        
-Arising in the period 3 1 7 2
Foreign currency translation adjustments 3 1 7 2
Effective portion of changes in fair value of cash flow hedges:        
-New fair value adjustments into reserve (33) (49) (59) 40
-Movement out of reserve to income statement 5   12  
-Movement in deferred tax 3 15 5 7
Effective portion of changes in fair value of cash flow hedges (25) (34) (42) 47
Items that will not be reclassified to income statement        
Re-measurement of employee benefit obligations (7) 24 (8) 52
-Deferred tax movement on employee benefit obligations 2 (7) 2 (15)
Total other comprehensive income that will not be reclassified to income statement (5) 17 (6) 37
Total other comprehensive (expense)/income for the period (27) (16) (41) 86
Total comprehensive (expense)/income for the period (37) 84 (52) 243
Attributable to:        
Equity holders $ (37) $ 84 $ (52) $ 243